Delphi, is both an archaeological site and a modern town in Greece on the south-western spur of Mount Parnassus in the valley of Phocis. In Greek mythology, Delphi was the site of the Delphic oracle, the most important oracle in the classical Greek world, and a major site for the worship of the god Apollo after he slew the Python, a deity who lived there and protected the navel of the Earth.